Casing elevator



E?" MAKER ELL.

Dec. 8, 1925- CASEWG ELEVATOR Film 12m 18, 1924 ATTORNEY Patented 8, i925.

entrain ELMEB, R. MAXXVELL. 0F BBIADFQRD, ETENNSYLVANIA.

CASJENG ELEVATOR.

Application filed September 23, 1924.. Serial No. 738,394.

To all UJZLOTM it may concern:

Be it known that 1, Emma E. MAXWELL, a citizen of the United States, residing at Bradford, in. the county of McKean and State of Pennsylvania, have invented certain new and useful Improvements in Gasing Elevators, of which the following is a specification.

This invention is for a casing elevator for use in connection with earth boring rigs.

In the most common types of easing elevators now in use, there are two semi-cir cularly curved pipe engaging members hav ing a pivotal connection with. each other at one end, and having their free ends detachably joined. The pivotal connection as heretofore made has been such that, when the two members are clamped tightly around a section of pipe, the pivot at the fixed joint is put in shear. This results in the bending and shearing of the pivot. Of course, when the pivot breaks, the sections detach, and when this happens, as it frequently does, when the elevator is attached to a pipe or other article to be lifted, the pipe or article may fall, perhaps causing an accident or making a fishing job necessary.

The present invention has for its principal object to provide an elevator having an improved hinge construction which will relieve the pin or pivot of the hinge from much of the strain heretofore put on it, and thereby render it less liable to breakage, and which, even in the event of breakage of the pin, will not permit the two members to separate as long as the detachable connecting means for the free ends of the jaws is in looking position. A much safer and more desirable elevator is thus provided.

The invention may be readily understood by reference to the accompanying drawings, in which:

Fig. 1 is a side elevation of an elevator constructed in accordance with my inven tion, the elevator being shown in conjunction with a section of pipe;

Fig. 2 is a similar end view;

Fig. 3 is a top view, showing the hinge partly in section;

Fig. 4: is a section on line IVIV of Fig. 1;

Figs. 5 and 6 are perspective views of the hinge ends of the two jaws members.

In the drawings, 5 designates one of two jaw members, and 6 is the other, Each member has a semi-circular pipe receiving portion intermediate its end. extensions. ,fi-iember 5 has a hinge extension 7 and a lamp extension 8. Member 6 has corresponding extensions 9 and 10, respectively.

The clamp extensions 8 and 10 may be of the usual construction, one of them, 8, can rying a locking link or loop 11 of usual construction, which, in the position shown in Fig. 1, holds the ends 8 and 10 together, but which may be swung in the manner indicated in dotted lines, to release the two ends and permit them to spread. I do not claim any novelty for this locking means, and any other suitable securing means could be used.

Hinge extension? of member 5 is best shown in Fig. 6. It is preferably the full height of the jaw, and has a transverse opening 7 therethrough, which in effect bifurcates it to provide upper and lower lugs, which lugs, however, are connected at their outer ends by a connecting portion or post 12. At 13 is a hole, through which pivot pin 14: passes. The post 12 preferably does not extend across the full width of the extension, and preferably has a cross sectional width of about half the width of the lugs, or extension, as will be apparent from Fig. 3.

The hinge extension 9 of jaw 6 is preferably only about half the height of the aw, and is best seen in Fig. 5. It has a rounded portion 9 that is received in the transverse opening 7 of extension 8. In Fig. 3, it will be noted that extension 7 has suitable curved surfaces for cooperation therewith. projecting beyond the rounded portion 9 is a tongue or lug 9". Pin 14 may pass through hole 9.

The tongue 9* permits the jaws to swing toward and from each other about pivot 14. When any spreading strain is put on the jaws, the tongue will engage post 12, to relieve the pivot. Even if the pivot pin 14 is entirely broken off or removed, the coacting parts of the hinge will not permit the separation of the jaws so long as the other ends 8 and 10 are secured together by the locking means. It is therefore impossible for the elevator to lose its load by reason of the pivot breaking or shearing. The life of the pivot is also prolonged by reason of it being thus protected.

Each jaw 5 and 6 may have the usual bail 15 carried thereby, by means of which the elevator may be lifted.

Various detail changes and modifications may be made in the construction of the device within the spirit of my invention, and Within the contemplation of the appended claims.

What I claim is:

1. A casing elevator comprising a pair of curved jaw members of corresponding heights, a transversely apertured hinge forming extension projecting directly from the curved portion of one jaw, a hinge forming extension on the other jaw passing through the aperture in the extension of the first and having a projecting tongue for engagement with a portion of the 'irst tension, a pivot passed through said e2:- tensions, and means for detachably connecting the other ends of the jaws.

2. A casing elevator comprising a pair of jaw members of corresponding heights and each having a curved portion and an extension projecting from the curved portion, one of the extensions being of the same height as its member and provided with an opening to receive the extension of the other jaw member, and a post, said other extension being fitted into the said opening and having a contact portion engaging the post.

3. A casing elevator comprising a pair of curved jaws, a transversely apertured hinge forming extension on one jaw including spaced apart portions and a connectirg member, a hinge 'lorming extension on the other jaw passing through the aperture in the extension of the first and having a projecting tongue for engagement with the connecting member of the first extension, a pin passing through the extension ot both jaws, and means for detachably connecting the other ends of the jaws.

l. A casing elevator comprisi; 4 a pair of jaw members each having a curved pipe engaging portion, one member having a transversely a rtnred hinge forming c2;- tension projecting from the curved portion and at one end thereof, the second aw having a rounded hinge forming extension projecting from the curved portion tl erect and received in the aperture of the extension of the first, the rounded extension of the second jaw having a longitudinally extent ing tongue adapted to engage a portion of the extension 'of the first jaw, a pin passed through said extensions, and means for detachably joining the other ends of the jaw members.

In testimony whereof I ai'iix my sigiiiature.

Eliliilflit MA hi "a l lillln 

